Electrically-heated soldering-iron.



No. 871,405. PATENTED NOV. 19.1907. H. HERTZBERG & M. J. WOHL. ELEGTRICALLY HEATED SOLDERING IRON.

APPLICATION FILED 1123,11, 1907.

/NVENTO/?S %rz;yflerfzz q Q Malice (I 7. 0711 1} 7 W ATTORNEYS UNITED STATES PATENT OFFICE.

HARRY HERTZBERG AND MAURICE I. WOHL, OF NEW YORK, N. Y., A SSIGNORS 'Tb ABBOT- AUGUSTUS LOW, OF HORSESHOE, NEW YORK.

ELIGrBICALLY-HEATED SOLDEBING-IBOIT.

Pltented Nov. 19, 1907.

Toallwhomttmaycomem:

' Be it lmown that we, HARRY Hna'rznnae economy in the consumption of t 16 and MAURICE J. WonL, citizens of the United States, and residents of the city of New York, borough of Brooklyn, in the county of Kings and State of New York have invented a certain new and useful Electrically Heated Soldering-Iron, of which the followi is a specification. his invention is a soldering iron to be heated by an electrical current, the object in view being to rapidly heat a mass of metal by a small volume of current, thereby securing e electric energ required to keep the device in a heated condition for service.

The soldering iron of this invention is sim- 'ple, compact and cheap. Theparts which are included in the electric circuit are inclosed for the purpose of obv'iat' injury thereto in usingl the device, and sliiid parts are insulated danger of short circuiting the current, thus enabling the soldering iron to be handled and used with safety by inexperienced operators.

The shank and handle portion of the device are constructed to obviate loss of heat by radiation and to prevent said handle from becoming-heated to such an extent as will char or burn it or interfere with the operator using the iron.

Various other advantages of the invention will appear in the com of a detailed description of one embodiment thereof.

' away and in section, ofa so derlng iron constructed in accordance with this invention, the plane of the section being indicated by the dotted line 11 of Fig. 2. Fig. 2 is a longitudinal section on the line 22 of Fig. 1. Fig. 3 is a detailpers ctive view illustrating anotherform of". ee'trical resistance which is wound'orcoiled on a core of insulating material, v

A designates a body or mass of -.metal which may be of an suitable nature, altho h we have foun copper to be suitable for t e purpose because of its high heat conductive properties. The body or mass A e ectrically to mimmize the,

may consist of one. or a plurality of pieces, but as shown, the body or mass is asingle piece. As shown, the body or mass A is pointed at one end by beveling the respective sides thereof on converging lines so as to meet in the nose or point a, this form of the body being found preferable in the actual work or service of the iron, although it will be understood that we do not intend to limit ourselves to any shape or size of the bod or mass A, nor in fact, of the complete im ement. The body or mass A is pro-. vi ed, furthermore, with a chamber, cavity or recess b, which is adapted to receive an electrical resistance, the latter being indicated .by the letter R in the drawing.

Various forms of the electrical resistance may be emplo ed, such for example, as a block, stri or length of molded carbon, or a thin metal '0 wire, or a metallic ribbon, and in the drawin s we have shown the thin metallic wire-in igs. 1 & 2, while Fig. '3 represents a metallic ribbon.

When a metallic resistance is employed, we prefer to wind or coil it on a core of suitable insulating. material. This core may, and preferably does, consist of a strip or layer of mica indicated by C. It should be understood that the resistance R is coiled or wra pedthe desired number of times around the ayer of insulating material C, and that one end 1' of this resistance wire or ribbon is carried or led lengthwise of the core 0. In Fi 3 the resistance is shown as a flat meta '0 ribbon R, which is coiled or wrapped on the flat layer C of insulatingmaterial. After winding the resistance wire or ribbon on the core C we arrange another layer D of resistance material between the winding of the wire and the return end 1' of said wire or ribbon, and the layers C D of insulating ma. terial and the resistance wire or ribbon are furthermore inclosed between other insulate ing la ers E E, which are also composed of thin s eets of .mica.

It will be seen that we build u the electrical resistance and layers of insu ating material in an extre'mel' com' act manner, so that said parts may be inc osed within the body or mass of metal A without increasing the size of said body or mass for the accommodation of the means em loyed by us for electrically heating the sol ering iron to the temperature necessary. for efiective service.

An important feature of the invention consists in arranging the electrical, resistance practically in contact with the ;mass or body of metal, and at the same time msulatmg the resistance electrically from such direct contact, whereby the heat developed by charg- 1 the resistance with an electrical current -w1l be absorbed by the body or mass of metal as fast as it is generated. We accomresistance is iven off or imparted directly a is insulated electrically from the -mass of As shown, we emplqy of the b to the mass 0 metal. In our invention the layers E E of mica are extremely thin so that they will serve to ermit the free and 'ractically unobstructe passa e of theheat om the resistance to the be y or mass of' metal, while at the same time said mica layers serve to electrically insulate the resistance from contact with the body or mass A, thus obviating the formation of a short circuit. I

From the foregoing description it will be noted that we employ a thin core composed of a single layer'of mica that we wind 'a thin metallic wire or ribbon on said core so as to produce a flattened winding, the convolutions of which winding on the opposite sides of the core are insulated-electrically by said core, and that the winding of the resistance metal by other thin, layers of mica. The flattened winding of resistance wire or ribbon presents an extended surface for contact mechanically with the mass of metal, for the reason that each face of each convolution is adapted, practically, for such contact with the mass of metal, within which mass the resistance is inclosed. The mica core and the layers of mica insulations are so thin that they offer practically no obstruction to the transmission of heat from the resistance to the metallic mass, although said mica is efficient in electrically insulating the resistance from the mass of metal. Our electrically operated heater is exceedingly comact in construction, and its use wlthinthe hody of a soldering iron does not require or necessitate any increase in the size of said bod inexcess of standard sizes of commercial soldering. irons now on the market.

Various mechanical'constructions adapted for the pu ose of manipulating the iron may be resorte to in connection with the body or mass A and the electrical resistance therein. a hollow shank F which is in the form tube that is split or bifurcated to produce the ears f, the latter being ada ted to overlap the respective sides y or mass A, whereby the shank and said body or mass may be united "dly by suitable 'fa'stening's such as screws Within-the hollow Shank are leadi wires or G which are attach to the res ective ends of the electrical resistance R or As shown, we prefer to incase these leading wires by a'tubular casing h h, and

these leading wires with the casings are housed within a hollow lining H. The casings h h and the linin H are composed of a suitable heat non-con ucting material, such for example as asbestos. The lining H is preferably tubular, and it extends substantially the'full length of the shank. The casi s hh inclose t e leading wires G G practical y from the body or mass .Of metal A to the end of the shank, whereby the leading wires are thoroughly protected in such a we as to prevent the radiation of heat to the s ank F.

The shank is equipped with a handle -I which may be composed of a suitable nonconductor. As shown, the handle is divided lengthwise to produce com lemental sections M, which are adapted to e drawn together by suitable screws 1', whereby -the handle may be clamped upon the end portion of the hollow shank F. Said handle is provided with an 'openi k at one end, and with a chamber in, into w 'ch chamber extends the end portion of the leading wires G G.

A conductor L is twisted to the leading wires G G within the chamber m, thus providing an anchorage for the aforesaid con-' ductor L. This conductor may) be supplied with a current from any suita le source of power, but as shown it is equipped with a socket connection 0.

The operationof the invention will be readily understood by those skilled in the art from the fore oing description taken in connection with t e drawi is adapted to belscrewe into a socket for the purpose 0 sn a current to the lead' wires G G 'aiiii 'iiiii resistance R. The h5 7 develo d by the resistance is transmitted throug .the mica layers E E directly to the respective side ortlons of the body-or mass of metal A, the atter operating to'absorb the heat directly from the said resistance.

In one embodiment of the invention we have found it advisable to employ an ex-- tremely thin wire or attenuated conductor as a resistance, and in some of our ex riments we have demonstrated that by inc os' the resistance within and in practically rect contact with the body or mass of, metal, said resistance is prevented from heating to such a degreeas to become red hot. This is owing to the fact that the heat developed by the re.-

sistance is transmitted .to and absorbed by the bed or mass of metal as rapidly as the heat is eveloped in the resistance.

A soldering iron constructed in accordance with our invention may be heated quickly owing to the intimate relationship between the resistance and the body or mass of metal, and we find from actual experience that the iron not only heats up vs quickly, but it consumes a relatively sm quantity of cum- The connectionO rent which renders the iron serviceable for the performance of its work.

Having thus fully described the invention, what we claim as new, and desire to secure by Letters Patent is: i

1. In a device of the class described, an external body or mass of heatabsorbing metal, a flat core therein, and a bare metal resistance wire or ribbon coiled in a single layer or winding on said core and inclosed within said body or mass of metal, said wire or ribbon being in mechanical contact throughout its length with said mass of heat-absorbing metal and insulated electrically therefrom, whereby the heat developed in said resistance is absorbed directly by the mass of metal.

2. In a device of the class described, an external hollow body or mass of heat-absorbing metal, a core of insulating material therein, a bare metal resistance wire or ribbon coiled in a single layer or winding on said core and inclosed therewith inside of said body or mass of metal, said resistance wire or ribbon being in mechanical contact throughout its len th and on its respective sides with the l)U( y or mass of heat-absorbing metal, and thin layers of heat transmitting and electrical insulating material between said wire or ribbon and the aforesaid mass of metal within which the Wire or ribbon is inclosed.

3. In a device of the class described, an external hollow body or mass of heat-absorbing metal, a thin flat core of insulating material, and an electrical resistance wire or ribbon wrapped on said core and inclosed therewith within said body or mass of metal, said wire or ribbon being in mechanical contact throughout its length with said body or mass of heat-absorbing metal.

4. In a device of the class described, an external hollow body or mass of heat-absorbing metal, an electrical resistance inclosed within said body or mass of metal and in mechanical contact therewith throughout the length of said resistance, and thin layers of mica intermediate of the resistance and said metallic mass, said mica layers bein in direct contact with the respective sides 0? said electrical posed electrical insulating material in direct contact with said resistance and with said mass or body of metal.

6. In a device ofthe class described, an external body or mass of heat-absorbing metal, a thin flat layer of mica forming a core of non-conducting material, a bare metal resistance wire or ribbon wrapped in a single layer or winding on the core and inclosed within the body or mass of heat-absorbing metal, and thin layers of mica forming electrical insulations between, and in direct contact with, both the resistance wire or ribbon and said body or mass of heat-absorbing metal.

7. In a device of the class described, a body or mass of heat-absorbing metal, an electrical resistance therein, a hollow shank fastened to said body or mass, suitable conductors in the shank, and a divided handle made separate from the shank and comprising members which are clamped detachably on said shank.

8. In a device of the class described, a body or mass of metal, an electrical resistance therein, a hollow shank, leading wires inclosed by the shank and connected with said resistance, a handle attached'to said shank and provided with an anchor chamber at one end of the, shank, and conductors anchored in said chamber of the handle and connected to the leading wires within said shank.

In testimony whereof we have signed our HARRY HERTZBERG. MAURICE J. WOHL.

Witnesses: r

JAs. H. GRIFFIN, H. IBERNHARD. 

